Clinical trial recruitment: 20 companies to consider

The consequences of recruitment failure — delayed timelines, inflated costs, and compressed development windows — make vendor selection a decision with material downstream effects. The market for clinical trial recruitment support spans a wide range — from digital advertising agencies and patient community platforms to integrated precision medicine partners that manage qualification, testing, and engagement within a single system. The distinction matters: companies optimized for patient volume function differently from those designed to move patients through genetically stratified eligibility pathways at scale. The right recruitment partner depends on the complexity of the eligibility criteria, the patient population being accessed, and the scope of operational support required. Below, we share how to know if a clinical trial is the right fit for your trial, what to look for in a patient recruitment company, and how to measure what matters. We then outline 20 clinical trial patient recruitment companies that can drive your research forward. 

How to evaluate a clinical trial patient recruitment company

Selecting a recruitment partner requires evaluating whether their model aligns with how your trial actually needs to function — not just what they offer in principle. The following dimensions determine fit in practice:

• Experience and expertise: For genetically stratified trials, the relevant question is not whether a partner has therapeutic area experience in general, but whether they understand eligibility pathways that depend on genetic confirmation. This requires operational familiarity with variant-driven funnels, testing logistics, and the point at which genetic literacy — or its absence — affects patient conversion. Broader oncology or rare disease experience matters most when it reflects this kind of execution-level understanding.
• Strategic approach: The relevant question for genetically stratified trials is whether a partner's strategy is built around genetic eligibility, not just patient volume. This means evaluating how they identify patients defined by specific variants, how testing is positioned and sequenced within the recruitment journey, and whether their outreach model accounts for the diagnostic access gaps that frequently constrain screened populations in rare and precision medicine contexts. In practice, 72% of participants are already patients at the trial site, and primary care physicians remain the top source of clinical trial information for the public.
• Level of support: Look for end-to-end services including outreach, prescreening, and engagement tools like virtual waiting rooms, which keep potential participants engaged and ready to join when needed, along with integrated genetic testing services that help match the right patients to the right trials. Integrating prescreening, engagement, and testing within a single workflow reduces handoff failures and preserves visibility across the participant journey — factors that directly affect conversion at each stage of the funnel.
• Ethical standards: Ensure strict adherence to patient privacy, informed consent, and regulatory compliance.
• Adaptability: Trials rarely execute as designed. Eligibility criteria may shift, site performance may underdeliver, or patient availability may diverge from feasibility assumptions. The structural question is whether a partner can reorient their approach based on real-time funnel data — not whether they describe themselves as flexible.

Success rates and metrics: Investigate the company’s past performance, particularly in meeting enrollment deadlines and retaining participants. Site-level performance is a common failure mode: 37% of sites under-enroll and 11% enroll zero participants. Ask for therapeutic-area-specific case studies, evidence of real-time strategy adjustment, and conversion rates across funnel stages (e.g., click-to-lead, lead-to-prescreen, prescreen-to-consent, consent-to-enrollment). Additionally, look for a partner who actively tracks and optimizes key metrics such as cost per participant, time to enroll participants, participant diversity, and conversion rates across the participant journey.

Communication and long-term collaboration: Finally, consider the company’s communication model at two levels: sponsor-facing (reporting, alignment, and coordination across sites or multiple trials) and patient-facing (clarity, accessibility, and responsiveness throughout prescreening and enrollment). Given that 70% of patients have never considered clinical trials as a treatment option, patient-facing communication can directly affect conversion and drop-off. A company that views your relationship as a partnership is more likely to invest in understanding your broader goals and working closely with you to achieve them, especially if you have multiple trials planned.

A partner evaluated against these dimensions is more likely to deliver measurable outcomes at each stage of the funnel — rather than high top-of-funnel volume that fails to convert to enrolled, qualified participants.

How to measure clinical trial recruitment performance

One of the most critical factors when selecting a clinical trial patient recruitment partner is understanding how they measure success and how those metrics align with your trial’s goals. Different companies may prioritize various aspects of recruitment, and it’s crucial to ensure that their definition of success matches your needs.

Make sure they measure what matters

Ensure your partner tracks these essential metrics:

By understanding how different recruitment companies measure success and aligning these metrics with your trial’s specific needs, you can choose a partner that not only meets your enrollment goals but also contributes to the overall success of your research. Make sure to ask detailed questions and review case studies to see how they’ve applied these metrics in previous trials, and how they plan to apply them to yours. If you’d like to learn more about how to measure success in patient recruitment, download our whitepaper.

20 clinical trial patient recruitment companies

The following companies represent a range of recruitment models, spanning digital engagement, site-based outreach, decentralised trial support, and genetics-integrated qualification. 

• Sano Genetics is a precision patient platform that connects patient identification, genetic testing, and long-term engagement within a single infrastructure — enabling sponsors to move from patient finding to genetics-confirmed eligibility with greater speed, traceability, and operational control. Sano's 360° platform integrates recruitment, genetic qualification, and longitudinal participant engagement within a single compliant environment — giving sponsors end-to-end visibility from patient identification through to enrollment, and a recontact-ready asset that retains value across future programs.
  
  
• OneStudyTeam is a patient enrollment platform for clinical trials that arms sponsors with rich data to drive quicker enrollment. Their enrollment offering for sites can also be paired with services from other recruitment partners. 
  
  
• SubjectWell is a patient recruitment company that supports clinical trial enrollment through direct-to-patient outreach and prescreening services.
  
  
• THREAD Research is a digital clinical trial patient recruitment company that uses a community partner network (CureClick) to find and connect with eligible patients.
  
  
• Elligo Health Research offers customized services to optimize clinical trial patient enrollment and engagement. They focus on attracting, educating, and retaining patients throughout the study lifecycle. They offer a wide variety of outreach approaches that are tailored to each study.
  
  
• Carenity is an online patient community that supports 500,000 patients and caregivers worldwide across 1,200 chronic and rare diseases. They provide clinical trial recruitment services as part of their trial optimization offering. 
  
  
• Embleema is a blockchain-based platform that recruits study patients online and securely shares medical data for clinical research. 
  
  
• Ripple Science offers participant recruitment and engagement tools to help research teams manage outreach, screening workflows, and study communications.
  
  
• PatientWing is a patient-centric clinical trial recruitment company that offers a comprehensive digital outreach strategy including advocacy groups, grassroots outreach, original content, and digital advertisements. They focus on rare disease, oncology, and difficult-to-recruit conditions.
  
  
• BBK Worldwide is a full-service agency that offers sponsors patient-centric solutions, concierge support, and a robust technology platform to drive patient recruitment.
  
  
• Clara Health offers a flexible suite of decentralized clinical trial tools, including virtual patient recruitment. Their recruitment engine blends patient advocacy partnerships, digital outreach, and grassroots engagement. They were acquired by M&B Sciences, Inc.
  
  
• StudyKik is a patient recruitment and retention platform for clinical trials that uses social media and mobile technology to engage patients. They offer end-to-end recruitment and continuous enrollment support through their in-house call center.
  
  
• ObvioHealth supports decentralized and hybrid clinical trials, including remote participation approaches that can reduce geographic barriers to enrollment.
  
  
• CSSi is a global, full-service patient recruitment company that provides creative development services as well as traditional and digital media advertising for recruitment. With 15 years of experience, they’ve worked in 40+ countries across 30+ therapeutic areas.
  
  
• CenterWatch provides clinical trial information and study listings that can support patient awareness and trial discovery.
  
  
• ClinicalConnection is a platform that connects its 850,000+ patient members with clinical trial opportunities. For sponsors, they offer customized study listings, digital marketing, and web development solutions.
  
  
• Power is a platform that helps match people to clinical trials and can support direct-to-patient recruitment through digital discovery and outreach.
  
  
• ResearchMatch is a national registry designed to connect volunteers with research studies, supporting recruitment across a range of study types.
  
  
• Trialbee is a digital health company that uses real-world data to identify and match motivated patients to clinical trials.
  
  
• Meridian Clinical Research is a clinical research site network that supports trial execution and patient access through its site footprint.